HomeMy WebLinkAboutGEO-Tech Review BLD2000-01330 - BLD Engineering / Geo-tech Reports - 2/14/2000 MARTIG ENGINEERING
P.O. Box 11850
Olympia, WA 98508-1850
(360) 754-9687
February 14, 2000
Mason County
Department of Community Development
426 W. Cedar
P.O. Box 578
Shelton, WA 98584
Attn: Randy Neff, Planner
Re: Geo-Tech Assess ment/Report Compliance Report for:
* Owner: Nora Boles
16851 31 St Ave South
Seattle, WA 98188
* Site Location: Spruce Street, Union, Mason County, Washington;
Lots 19 & 20 of Block 20, Union-Grays Harbor & UCRR Add.;
*Tax Parcel No.: 32232 52 20019;
* Mason County: Sec 32, Township 22 N, Range 3 W; &
* PROPOSED SINGLE FAMILY RESIDENSE.
Dear Mr. Neff:
I, Kenneth W. Martig, Jr., PE, of Martig Engineering have completed my engineering
investigations regarding the Geotechnical Assessment/Report requirements associated
with the above referenced property overlooking Hood Canal, looking north.
This Geotechnical Assessment/Report letter report presents our findings.
In summary, the measured slope of the property is16.7% and no drainage, geological,
or slope condition of instability was found that would prevent the approval of this Single
Family Residential Development as proposed.
INVESTIGATION SOURCES
1. Forest Practice Base Map (Sec. 22, T 22 N., R. 03 W.,), Attach. #1;
2. Elevation Section View of Site (Section A-A, taken from Attach. #1), Attach. #2;
3. Stereo Photographs dated 8/10/97 (photo 39-80-70 copy), Attach. #3;
1
4. USGS 7.5 Minute Quadrangle Topographic Map (Union), Attach. #4;
5. 1980 DNR Coastal Zone Atlas, Attach. #5;
6. Slope stability, USGS/Carson MAP 1-853F, Attach. #6;
7. Ken Martig, Jr., PE February 4, 2000 Field Trip Site Investigation; &
8. Soils Survey, Mason County Washington, Series 1951, No. 9.
PROPOSED ACTION
The proposed action at this site is the development of one private single family
residence.
Existing Union public roads will be used for access to the residence building site which
is to be located immediately north of Spruce Street on Lots 19 & 20 of Block 20 of the
Union-Grays Harbor & UCRR Addition (see Section A-A, Attachments #1 & #2).
An On-Site Septic System will be used to serve the proposed single family residence,
approval being processed. An existing community water system will supply domestic
water to the residence.
LAND DEVELOPMENT PLAN
The Nora Boles plans to develop a private single family residence on this property.
INVESTIGATION DISCUSSION
Attachments #1 & #2 show the location and elevation view of the property. The slope of
the proposed building site lot was found to be 16.7% by survey measurement.
Attachment#3 shows the site on a 1"=500' enlarged Aerial Photograph (8/10/97).
Attachment#4 shows the site on the Union USGS Quadrangle Map.
Attachments #5 & #6 show the property's location on the two Slope Stability maps, the
Coastal Zone Atlas Map & the USGS/Carson MAP 1-853F. As can be seen, the Boles
site lies on the boundary between land designated as stable and land that could
become unstable by development activity.
Because these maps present a broad-brush representation of stability/instability and
since the northerly portion of the Boles property is designated "stable", a field survey of
the property was conducted to identify the actual slope of the property.
2
Martig Engineering found that the site slope is 16.7%, just slightly above the 15.0% that
is deemed to be stable. All follow-up research and investigations showed that this land
is stable and will not become unstable if a single-family residence is developed here. A
review of the 8/10/97 DNR stereo aerial photographs with stereo glasses confirmed a
stable terrain, no slide zones, wet areas or other signs of instability were visible.
The Mason County Soil Survey showed that the soils are an Alderwood gravely, sandy,
loam with its till layer approximately 24" to 32" deep.
Numerous single-family residences have been developed on lots within this Union
housing development. No visible signs of slope instability were found.
DRAINAGE AND EROSION CONTROL
Very little groundwater/interflow or surface water runoff is tributary to the Boles site.
Most upgradient runoff drains through a draw well west of the site. Spruce Street has
roadside ditches that halt runoff from south to north. Fir Street below also has roadside
ditches to collect and convey runoff.
CONCLUSION
The geological soil and slope conditions at the site of the proposed residence are
stable and compatible with the proposal to place a private single family residence at
this site.
Therefore, no adverse impact on the hillside should be experienced if this proposed
residential development is allowed, and properly permitted by Mason County.
This Geotechnical Assessme eport Is Certified by:
1
L�n�eth artig, Jr., P
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MASON COUNTY
PUBLIC WORKS DIRECTOR/COUNTY ROAD ENGINEER
Shelton,Washington 98594
DATE: Nov. 13''', 2000
INTER-DEPARTMENTAL COMMUNICATIONS
TO: Shandra O'Haleck, DCD - Planner
FROM: Alan A. Tahja, P/W - Co. Hydr. Engr. DCD/Planning WO# 00-0096
SUBJ: Geo-Tech Assessment Review NAME: Nora Boles 2 Union
BLD2000-01330
Shandra,
A geotechnical assessment prepared for the proposed Nora Boles residence at Union has been
received and reviewed by Public Works.
The report conforms to standards of sound engineering principles and practices and conforms to
the requirements of DCD for geotechnical assessment reporting. If the site plan included in the
Building Permit Application is considered a part of the geotechnical investigation,the
assessment could be entertained as a geotechnical report under Mason County policy guidelines.
The assessment indicates that the measured slope on the property is 16.7%,which seems
reasonable to assume would oily require an assessment to be prepared, assuming there are no
surface indications of instabil
In the absence of any additional information indicating instability,the asssment may be
considered acceptable, and there appears to be no justification for requiring additional site
investigation or reporting. If the engineer who authored the assessment had included a site plan
containing the information required in Mason County policies(Yando's 10/6/98 Memo),this
assessment could be entertained as a geotechnical report.
With these issues in mind,I feel this assessment should be accepted and the project allowed to
proceed through permit processing.
Please feel free to contact me at County extension 461 if you have any questions regarding these
comments, or if you feel any features need further discussion or attention.
4erely,
lan A. Tahj
File: H:\WP\GEO\ASESMNTS\Boles.doc
1
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